By now, you’ve probably see Commander Chris Hadfield’s tear-jerking farewell to the International Space Station: a cover of David Bowie’s classic space song, Space Oddity, filmed and performed by Hadfield himself in zero-g. In case you haven’t, we’ve embedded it above: it’s hard not to be proud of humanity after watching it.

But do you know how Hadfield actually recorded it? With his iPad, of course.